Research Article Details

Article ID: A49751
PMID: 35647758
Source: J Clin Endocrinol Metab
Title: Normal HDL cholesterol efflux and anti-inflammatory capacities in type 2 diabetes despite lipidomic abnormalities.
Abstract: OBJECTIVE: To assess whether, in type 2 diabetic (T2D) patients, lipidomic abnormalities in high density lipoproteins (HDL) are associated with impaired cholesterol efflux capacity and anti-inflammatory effect, two pro-atherogenic abnormalities. DESIGN AND METHODS: This is a secondary analysis of the Lira-NAFLD study, including 20 T2D patients at T0 and 25 control subjects. Using liquid chromatography/tandem mass spectrometry, we quantified 110 species of the main HDL phospholipids and sphingolipids. Cholesterol efflux capacity was measured on THP-1 macrophages. The anti-inflammatory effect of HDL was measured as their ability to inhibit the TNFα-induced expression of Vascular Cell Adhesion Molecule-1 (VCAM-1) and Intercellular Cell Adhesion Molecule-1 (ICAM-1) on Human Vascular Endothelial Cells (HUVEC). RESULTS: The cholesterol-to-triglyceride ratio was decreased in HDL from T2D patients compared to controls (-46%, P=0.00008). As expressed relative to apolipoprotein AI, the amounts of phosphatidylcholines, sphingomyelins and sphingosine-1-phosphate were similar in HDL from T2D patients and controls. Phosphatidylethanolamine-based plasmalogens and ceramides were respectively 27% (P=0.038) and 24% (P=0.053) lower in HDL from T2D patients than in HDL from controls, whereas phosphatidylethanolamines were 41% higher (P=0.026). Cholesterol efflux capacity of apoB-depleted plasma was similar in T2D patients and controls (36.2±4.3 vs 35.5±2.8%, P=0.59). The ability of HDL to inhibit the TNFα-induced expression of both VCAM-1 and ICAM-1 at the surface of HUVEC was similar in T2D patients and controls (-70.6±16.5 vs -63.5±18.7%, P=0.14 and -62.1±13.2 vs -54.7±17.7%, P=0.16, respectively). CONCLUSION: Despite lipidomic abnormalities, the cholesterol efflux and anti-inflammatory capacities of HDL are preserved in T2D patients.
DOI: 10.1210/clinem/dgac339